My kids thought I was a ghost for Halloween this year — I didn't tell them I was actually Michael Myers on the verge of strangling a topless P.J. Soles with a telephone cord. I turned a lot of heads in Park Slope. Little kids were terrified. I upstaged people in amazing getups. A sheet over one's head is the Ur-Halloween costume, but no one ever thinks of it anymore. Are there KKK associations? Something creeped people out. You'd think they'd seen a ghost.